MCQ
If general term of an A.P. is 3n then find common difference.
- A2
- B3
- C5
- D6
Solution:
Given, an = 3n.
We know, d = an - an-1 = 3n – 3(n - 1) = 3.
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If in the expansion of $(\text{a}+\text{b})^{\text{n}}$ and $(\text{a}+\text{b})^{\text{n}}+3,$ the ratio of the coefficients of coefficients of second and third terms, and third and fourth terms respectively are equal, then n is:
The real value of $\theta$ for which the expression $\frac{1+\text{i}\cos\theta}{1-2\text{i}\cos\theta}$ is a real number is:
$\text{n}\pi+\frac{\pi}{4}$
$\text{n}\pi+(-1)^{\text{n}}\frac{\pi}{4}$
$2\text{n}\pi\pm\frac{\pi}{2}$
None of these.